42174989 has 2 divisors, whose sum is σ = 42174990. Its totient is φ = 42174988.

The previous prime is 42174953. The next prime is 42174997. The reversal of 42174989 is 98947124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41705764 + 469225 = 6458^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 42174989 - 2⁸ = 42174733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42174949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21087494 + 21087495.

It is an arithmetic number, because the mean of its divisors is an integer number (21087495).

Almost surely, 2^42174989 is an apocalyptic number.

It is an amenable number.

42174989 is a deficient number, since it is larger than the sum of its proper divisors (1).

42174989 is an equidigital number, since it uses as much as digits as its factorization.

42174989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 42174989 is about 6494.2273597403. The cubic root of 42174989 is about 348.0847467229.

The spelling of 42174989 in words is "forty-two million, one hundred seventy-four thousand, nine hundred eighty-nine".